source: branches/3.2/mindi-busybox/util-linux/fdformat.c @ 3186

Last change on this file since 3186 was 2725, checked in by bruno, 9 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
File size: 3.5 KB
Line 
1/* vi: set sw=4 ts=4: */
2/* fdformat.c  -  Low-level formats a floppy disk - Werner Almesberger
3 * 5 July 2003 -- modified for Busybox by Erik Andersen
4 *
5 * Licensed under GPLv2, see file LICENSE in this source tree.
6 */
7
8#include "libbb.h"
9
10
11/* Stuff extracted from linux/fd.h */
12struct floppy_struct {
13    unsigned int    size,       /* nr of sectors total */
14            sect,       /* sectors per track */
15            head,       /* nr of heads */
16            track,      /* nr of tracks */
17            stretch;    /* !=0 means double track steps */
18#define FD_STRETCH 1
19#define FD_SWAPSIDES 2
20
21    unsigned char   gap,        /* gap1 size */
22
23            rate,       /* data rate. |= 0x40 for perpendicular */
24#define FD_2M 0x4
25#define FD_SIZECODEMASK 0x38
26#define FD_SIZECODE(floppy) (((((floppy)->rate&FD_SIZECODEMASK)>> 3)+ 2) %8)
27#define FD_SECTSIZE(floppy) ( (floppy)->rate & FD_2M ? \
28                 512 : 128 << FD_SIZECODE(floppy) )
29#define FD_PERP 0x40
30
31            spec1,      /* stepping rate, head unload time */
32            fmt_gap;    /* gap2 size */
33    const char  * name; /* used only for predefined formats */
34};
35struct format_descr {
36    unsigned int device,head,track;
37};
38#define FDFMTBEG _IO(2,0x47)
39#define FDFMTTRK _IOW(2,0x48, struct format_descr)
40#define FDFMTEND _IO(2,0x49)
41#define FDGETPRM _IOR(2, 0x04, struct floppy_struct)
42#define FD_FILL_BYTE 0xF6 /* format fill byte. */
43
44int fdformat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
45int fdformat_main(int argc UNUSED_PARAM, char **argv)
46{
47    int fd, n, cyl, read_bytes, verify;
48    unsigned char *data;
49    struct stat st;
50    struct floppy_struct param;
51    struct format_descr descr;
52
53    opt_complementary = "=1"; /* must have 1 param */
54    verify = !getopt32(argv, "n");
55    argv += optind;
56
57    xstat(*argv, &st);
58    if (!S_ISBLK(st.st_mode)) {
59        bb_error_msg_and_die("%s: not a block device", *argv);
60        /* do not test major - perhaps this was an USB floppy */
61    }
62
63    /* O_RDWR for formatting and verifying */
64    fd = xopen(*argv, O_RDWR);
65
66    /* original message was: "Could not determine current format type" */
67    xioctl(fd, FDGETPRM, &param);
68
69    printf("%s-sided, %d tracks, %d sec/track. Total capacity %d kB\n",
70        (param.head == 2) ? "Double" : "Single",
71        param.track, param.sect, param.size >> 1);
72
73    /* FORMAT */
74    printf("Formatting... ");
75    xioctl(fd, FDFMTBEG, NULL);
76
77    /* n == track */
78    for (n = 0; n < param.track; n++) {
79        descr.head = 0;
80        descr.track = n;
81        xioctl(fd, FDFMTTRK, &descr);
82        printf("%3d\b\b\b", n);
83        if (param.head == 2) {
84            descr.head = 1;
85            xioctl(fd, FDFMTTRK, &descr);
86        }
87    }
88
89    xioctl(fd, FDFMTEND, NULL);
90    printf("done\n");
91
92    /* VERIFY */
93    if (verify) {
94        /* n == cyl_size */
95        n = param.sect*param.head*512;
96
97        data = xmalloc(n);
98        printf("Verifying... ");
99        for (cyl = 0; cyl < param.track; cyl++) {
100            printf("%3d\b\b\b", cyl);
101            read_bytes = safe_read(fd, data, n);
102            if (read_bytes != n) {
103                if (read_bytes < 0) {
104                    bb_perror_msg(bb_msg_read_error);
105                }
106                bb_error_msg_and_die("problem reading cylinder %d, "
107                    "expected %d, read %d", cyl, n, read_bytes);
108                // FIXME: maybe better seek & continue??
109            }
110            /* Check backwards so we don't need a counter */
111            while (--read_bytes >= 0) {
112                if (data[read_bytes] != FD_FILL_BYTE) {
113                     printf("bad data in cyl %d\nContinuing... ", cyl);
114                }
115            }
116        }
117        /* There is no point in freeing blocks at the end of a program, because
118        all of the program's space is given back to the system when the process
119        terminates.*/
120
121        if (ENABLE_FEATURE_CLEAN_UP) free(data);
122
123        printf("done\n");
124    }
125
126    if (ENABLE_FEATURE_CLEAN_UP) close(fd);
127
128    /* Don't bother closing.  Exit does
129     * that, so we can save a few bytes */
130    return EXIT_SUCCESS;
131}
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